I recommend Snazaroo body paint. You can find them in pretty much any local craft store, definitely A.C. Moore and Micheals. They have pretty simple colors but overall it's probably one of the best kinds of face paints. It's waterbased and if you don't use too much water to apply it then it doesn't feel gross either, which is certainly a plus. They aren't too expensive either, usually about $15 for a pack of six.